I will decide! Posted July 3, 2010 Posted July 3, 2010 looking for a valve preamp. I have a Rega with Elys 2, Output: 6.8 - 7.2mV fisher valve amp -the phono input are - HI : 16mv - low : 3.5mv any suggestions/ideas great-fully accepted playing records are just too trebbley and bass is all muddled at moment, thanks:)
JoM1553552749 Posted July 3, 2010 Posted July 3, 2010 Are you sure it's the preamp and not the turntable setup?
I will decide! Posted July 3, 2010 Author Posted July 3, 2010 JoM;126684 wrote: Are you sure it's the preamp and not the turntable setup? i do not have a preamp at present - the Rega and cartridge are brand new and set up by the seller, the amp has been tested and new tubes...... i do not know what else i could be missing other than i need a preamp??? any suggestions be accepted here:D
Papa Hemi Posted July 3, 2010 Posted July 3, 2010 I would expect that you would use the phono input directly, however the output from the cartridge looks to be on the high side. I would be using a phono pre-amp if my amp did not have a phono input. Yours does, switchable between MM and ceramic it seems. Have you tried it?
I will decide! Posted July 3, 2010 Author Posted July 3, 2010 yes - one louder but trebble and bass muddy and the other is good but still not what i would say listenable. the nation 3-1 one i have sounds better playing the black n blue album by stones:(:confused:
Guest Posted July 3, 2010 Posted July 3, 2010 Ditto on the above. Why valve ? There are plenty of good cheap SS preamps that will see off most vintage valves... Eg. NAD PP2, Project Phonobox, Cambridge Audio 640P etc.
I will decide! Posted July 3, 2010 Author Posted July 3, 2010 michael w;126698 wrote: Ditto on the above. Why valve ? There are plenty of good cheap SS preamps that will see off most vintage valves... Eg. NAD PP2, Project Phonobox, Cambridge Audio 640P etc. just thought i have a valve amp - keeping it all the same..... but i can be persuaded to try ss......... be some really clued up people in here - thats why im asking
rotaspec Posted July 3, 2010 Posted July 3, 2010 It's possible the old Fisher equalisation is set up for something other than RIAA. There were several "standards" in the old days for pickup cartridges. The valve section of the diyaudio forum would be a good place to ask about that: http://www.diyaudio.com/forums/tubes-valves/ It may be just a matter of changing a few resistors and capacitors in the input stage to get it right. Gary
rotaspec Posted July 4, 2010 Posted July 4, 2010 I just looked at the diagrams posted on diyaudio. I can see potential for problems with an old amp like this particularly with the switches. So first off, be sure you have the rotary selector switched to the phono position AND the phono/tape slider switch in the phono position. If the slider is in the tape position, you will end up with sound as you describe. If that is not the problem, then the switches themselves could be needing a clean (Deoxit). Having the phono signal go straight through a switch without amplification first is asking for trouble, but I see why they did it - they could use the same gain stage for pickup and tape heads. As no-one uses tape-head direct these days (now tape machines all have their equalisation built-in), you could afford to replace the entire stage with a design like Eli posted. However, that will take someone with experience to make it work within the Fisher chassis. Gary
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